Kinu Ayatsuji is an assassin after Koushi. In episode 19 she disguises herself as a live in house keeper named Ayatsu Knu to get close to her target. Kinu loves playing tennis and is willing to repair a roof to keep up her ruse.
Bonus:
Shintarou Inoue is a manga only character. She is the heir to the Inoue clan and was raised as a son by her father.
